I will definitely recommend Nanthwan's place to anyone (young couple or friends), except for the elderly who has problems walking upstairs (my room is in 5th floor - that's the only cons since there is no elevator). However, let's focus on the good things:
1) Good value accommodation: great pricing for the location (walking distance to Icon Siam about 10-15min, 12 min walking distance to Sathorn pier), got few good restaurants close to the areas
2) Clean and decent size unit: the place can comfortably fill 4-5 person.
3) Comfortable mattress and pillow: I had great night sleeping after long day of walking.
4) Quiet and safe surrounding: although you will hear a bit of sound from the BTS train.